fix: Remove duplicate headers and fix ordering in CHANGELOGs (#331)

Fixes CHANGELOG corruption introduced in #324 (release-plz-2025-08-15) where:
- Duplicate headers were inserted in 4 CHANGELOG files
- Version entries were in incorrect order (old before new)

Changes:
- Remove duplicate "# Changelog" headers from atrium-api, bsky-sdk, atrium-repo, and bsky-cli
- Reorder version entries so newest versions appear first (following Keep a Changelog format)

Affected files:
- atrium-api/CHANGELOG.md (v0.25.5 and v0.25.6)
- bsky-sdk/CHANGELOG.md (v0.1.21 and v0.1.22)
- atrium-repo/CHANGELOG.md (v0.1.5 and v0.1.6)
- bsky-cli/CHANGELOG.md (v0.1.34 and v0.1.35)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

Author: sugyan

atrium-api/CHANGELOG.md

@@ -7,25 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.25.5](https://github.com/atrium-rs/atrium/compare/atrium-api-v0.25.4...atrium-api-v0.25.5) - 2025-08-16
-
-### Fixed
-
-- Add explicit lifetime annotation to Language::as_ref return type ([#323](https://github.com/atrium-rs/atrium/pull/323))
-# Changelog
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
 ## [0.25.6](https://github.com/atrium-rs/atrium/compare/atrium-api-v0.25.5...atrium-api-v0.25.6) - 2025-10-01
 
 ### Other
 
 - Update for latest lexicon ([#327](https://github.com/atrium-rs/atrium/pull/327))
 
+## [0.25.5](https://github.com/atrium-rs/atrium/compare/atrium-api-v0.25.4...atrium-api-v0.25.5) - 2025-08-16
+
+### Fixed
+
+- Add explicit lifetime annotation to Language::as_ref return type ([#323](https://github.com/atrium-rs/atrium/pull/323))
+
 ## [0.25.4](https://github.com/atrium-rs/atrium/compare/atrium-api-v0.25.3...atrium-api-v0.25.4) - 2025-05-25
 
 ### Other

atrium-repo/CHANGELOG.md

@@ -7,25 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.1.5](https://github.com/atrium-rs/atrium/compare/atrium-repo-v0.1.4...atrium-repo-v0.1.5) - 2025-08-16
-
-### Other
-
-- updated the following local packages: atrium-api, atrium-api
-# Changelog
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
 ## [0.1.6](https://github.com/atrium-rs/atrium/compare/atrium-repo-v0.1.5...atrium-repo-v0.1.6) - 2025-10-01
 
 ### Fixed
 
 - Apply clippy suggestions and skip stable clippy in CI ([#330](https://github.com/atrium-rs/atrium/pull/330))
 
+## [0.1.5](https://github.com/atrium-rs/atrium/compare/atrium-repo-v0.1.4...atrium-repo-v0.1.5) - 2025-08-16
+
+### Other
+
+- updated the following local packages: atrium-api, atrium-api
+
 ## [0.1.4](https://github.com/atrium-rs/atrium/compare/atrium-repo-v0.1.3...atrium-repo-v0.1.4) - 2025-05-25
 
 ### Other

bsky-cli/CHANGELOG.md

@@ -7,24 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.1.34](https://github.com/atrium-rs/atrium/compare/bsky-cli-v0.1.33...bsky-cli-v0.1.34) - 2025-08-16
+## [0.1.35](https://github.com/atrium-rs/atrium/compare/bsky-cli-v0.1.34...bsky-cli-v0.1.35) - 2025-10-01
 
 ### Other
 
-- updated the following local packages: bsky-sdk
-# Changelog
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
+- Update for latest lexicon ([#327](https://github.com/atrium-rs/atrium/pull/327))
 
-## [0.1.35](https://github.com/atrium-rs/atrium/compare/bsky-cli-v0.1.34...bsky-cli-v0.1.35) - 2025-10-01
+## [0.1.34](https://github.com/atrium-rs/atrium/compare/bsky-cli-v0.1.33...bsky-cli-v0.1.34) - 2025-08-16
 
 ### Other
 
-- Update for latest lexicon ([#327](https://github.com/atrium-rs/atrium/pull/327))
+- updated the following local packages: bsky-sdk
 
 ## [0.1.33](https://github.com/atrium-rs/atrium/compare/bsky-cli-v0.1.32...bsky-cli-v0.1.33) - 2025-05-25
 

bsky-sdk/CHANGELOG.md

@@ -7,19 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [0.1.21](https://github.com/atrium-rs/atrium/compare/bsky-sdk-v0.1.20...bsky-sdk-v0.1.21) - 2025-08-16
-
-### Other
-
-- updated the following local packages: atrium-api
-# Changelog
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased]
-
 ## [0.1.22](https://github.com/atrium-rs/atrium/compare/bsky-sdk-v0.1.21...bsky-sdk-v0.1.22) - 2025-10-01
 
 ### Fixed
@@ -30,6 +17,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Update for latest lexicon ([#327](https://github.com/atrium-rs/atrium/pull/327))
 
+## [0.1.21](https://github.com/atrium-rs/atrium/compare/bsky-sdk-v0.1.20...bsky-sdk-v0.1.21) - 2025-08-16
+
+### Other
+
+- updated the following local packages: atrium-api
+
 ## [0.1.20](https://github.com/atrium-rs/atrium/compare/bsky-sdk-v0.1.19...bsky-sdk-v0.1.20) - 2025-05-25
 
 ### Other